Practical Security in Linux

The practical aspects of ensuring security in Linux are considered. The system architecture, privilege levels, and access control mechanisms (DAC, MAC, SELinux, AppArmor) are described in detail. Recommendations are given for configuring secure boot, auditing, logging, and controlling user activity. Special attention is paid to application isolation, network security, data and memory protection, as well as counteracting rootkits and malware. Methods of encryption, kernel hardening, and the use of IDS/IPS systems are discussed. Memory protection, compiler configuration, and kernel security hardening are explained. The concluding chapters focus on investigating security incidents: collecting and analyzing logs, using forensic tools, documentation, recovery, and post-incident analysis.